Forged Pistons for Acura/Honda, K20A, 86.5mm, 10.5:1 Heavy Duty (1.100 boss span) (CP Pistons SC81401)
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|
Make |
Honda |
|
Model |
K20A |
|
Part Number |
SC81401 |
|
Cylinders |
4 |
|
Bore (in) |
3.406 |
|
Bore (mm) |
86.5 |
|
Size |
+0.5mm |
|
Stroke |
86 |
|
Conrod |
139 |
|
Comp Height (in) |
1.181 |
|
Comp Height (mm) |
30 |
|
Dom/Dish CC |
2.54 |
|
Compression Ratio |
10.5 |
|
Weight (Grams) |
385 |
|
Pin (mm) |
22 |
|
Rings |
CPT-3406PVD |
|
Ring Thickness |
1.2 x 1.2 x 2.0mm |
|
Pin included (Standard) |
866-2250-25CP3C |
|
Upgraded Pin |
NA |
|
Ultra Duty Pin |
NA |
|
Locks |
866x063 SWL |
CP pistons are compatible with oversized valves and high lift camshafts. CP Pistons represent the highest quality and is engineered for maximum power. Standard features include: Deep valve reliefs accommodate high lift camshafts; Larger valve reliefs for +1mm valve sizes; Custom skirt cam and barrel design; Accumulator grooves; High strength aluminum forgings; High performance rings; Fully CNC machined and balanced to +/- 1 gram; Wrist pins included at no additional cost; Double pin oilers force fed from oil ring groove; Pin lock grooves for easy lock removal; Pin fitting included.
| Product Name | Forged Pistons for Acura/Honda, K20A, 86.5mm, 10.5:1 Heavy Duty (1.100 boss span) (CP Pistons SC81401) |
|---|---|
| Brands | CP Carrillo |
| Engine | K20 |
| Make | Honda |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What compression ratio do the CP Pistons SC81401 provide for the K20A engine?
The CP Pistons SC81401 provide a compression ratio of 10.5:1 for the K20A engine. This ratio is suitable for applications that require a balance between performance and reliability, but ensure proper tuning and fuel quality to avoid detonation.
What is the recommended bore clearance for the CP Pistons SC81401?
The recommended bore clearance for the CP Pistons SC81401 is typically around 0.0015" to 0.0025". However, this can vary based on the specific engine build and intended use, so it's essential to consult with your engine builder for the best fit.
Are the CP Pistons SC81401 compatible with high lift camshafts?
Yes, the CP Pistons SC81401 are designed with deep valve reliefs that accommodate high lift camshafts, making them suitable for performance applications where increased airflow is required.
What is the weight of the CP Pistons SC81401, and how does it affect engine performance?
The CP Pistons SC81401 weigh 385 grams each. A lighter piston can improve engine response and reduce reciprocating mass, which can enhance overall performance, especially at higher RPMs.
What type of wrist pins are included with the CP Pistons SC81401?
The CP Pistons SC81401 come with standard wrist pins (part number 866-2250-25CP3C) included at no additional cost. Ensure proper fitting during installation to maintain reliability under high-stress conditions.
